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Showing content with the highest reputation on 07/01/19 in all areas

  1. 4 points
    Cloudy as usual so I entertain myself with processing other peoples data. This time from the public data pool at Astrobin posted by Robert Huerbsch. 6 hours of HaOiii data from a 5" refractor. I mixed Ha and Oiiii 50:50 as a green channel and I aimed at processing it in a way that would make it look "natural" or RGB. All done in PS. Is it just me that see it as an alien running towards the finish line in an interstellar marathon?
  2. 2 points
    Everybody needs more time on M78!!! This is a good composition. Olly
  3. 2 points
    New photography blog up https://danielkenealyphotography.com/blog
  4. 1 point
    For me it has to be Fornax, a humble constellation, until the HST delivered the Extreme Deep Field Image from within it’s boundaries. Sure, I know any part of the sky would reveal something similar, but this is the little patch of sky where we have gone really, really deep.
  5. 1 point
    Great shot and the alien vision is inspired! lly
  6. 1 point
    Florent, Great image! I really like the rework on the imaging train of the TeleVue, looks rock solid. I used the np101is some years ago and it is optically superb. Regards Pieter
  7. 1 point
    I’ve seen something similar under my bathroom basin for moving the plug up and down.
  8. 1 point
    Very nice review ,well done. Bob.
  9. 1 point
    When I first used a Newtonian for imaging I remember my stars looking like tadpoles. I battled for ages adjusting and tweaking collimation with no change. I'm sure there are many of you who can relate to the frustration, I guess its all part of the imaging experience. All this time i had my fans running. One night I was going through the motions trying to solve the issue and unplugged the fans. It was like a light switch, the stars almost instantly became round. I cant tell you how i felt, my scope wasnt a dud after all. Delighted with what I had discovered I set to start imaging Andromeda which was in the East and rising nicely. Odd stars were back again, Completely deflated I packed up and went to bed. The next clear night I thought I would try a few things. Testing the scope at different altitudes, the stars were good while the scope faced up but bad when I moved closer to the horizon. You could be forgiven thinking it might be flex or just the seeing as you move through thicker atmosphere, but these stars change shape almost looking like a flame from a candle. With flex you would get odd stars but more or less stable in one position and bad seeing wouldn't be bias to one side, the wobble would appear across the whole star. So knowing what I found with the fans I tried running the fans but backward. Well the difference was instant....pin stars! The solution was to run my fans on suck. My conclusion was when the fans are on blow air passes the back of the mirror over its edges creating disturbed air flow. When the fans are on suck the tube currents are straitened and flow down the tube nice and evenly. The obvious problem is with the fans on suck is your mirror is likely to dew up sooner and then there is the potential for dust. This is based around a closed tube Newtonian, I would imagine an open truss tube would be unaffected by much of this. Many years on I'm now using a much larger scope with a wider aperture tube but I did grab a couple of frames to illustrate the effects of tube currents and the result with the fans on suck. Fans running on suck Fans switched off Thanks for taking the time to read. Peter Shah
  10. 1 point
    Really pleased with these images so thought I'd enter for once. 3.5 hrs from 6.10.18 2.5min exposures f5 using a canon 6d with Idas d1 filter.
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